Democratic presidential candidate Hillary Clinton speaks at a campaign appearance Saturday, April 2, 2016 at The Lismore Hotel in downtown Eau Claire, Wis. Wisconsin holds its primary election Tuesday, April 5.
Democratic presidential candidate Hillary Clinton speaks at a campaign appearance Saturday, April 2, 2016 at The Lismore Hotel in downtown Eau Claire, Wis. Wisconsin holds its primary election Tuesday, April 5. Steve Kinderman - The Eau Claire Leader-Telegram via AP

Hillary Clinton's frustration grows as primary race drags on

HILLARY Clinton snapped at a protester from the Greenpeace environmental group.

She linked Democratic rival Bernie Sanders and conservative tea party Republicans. And she bristled with anger when nearly two dozen Sanders supporters marched out of an event near her home outside New York City, shouting "if she wins, we lose."

"They don't want to listen to anyone else," she shot back.

"We actually have to do something. Not just complain about what is happening."

After a year of campaigning, months of debates and 35 primary elections, Sanders is finally getting under Clinton's skin in the Democratic presidential race.

Clinton has spent weeks largely ignoring Sanders and trying to focus on Republican front-runner Donald Trump. Now, after several primary losses and with a tough fight in New York on the horizon later this month, Clinton is showing flashes of frustration with the Vermont senator " irritation that could undermine her efforts to unite the party around her candidacy.

According to Democrats close to Hillary and former President Bill Clinton, both are frustrated by Sanders' ability to cast himself as above politics-as-usual even while firing off what they consider to be misleading attacks. The Clintons are even more annoyed that Sanders' approach seems to be rallying " and keeping " young voters by his side.

While Hillary Clinton's team contends her lock on the nomination is "nearly insurmountable," the campaign frequently grumbles that Sanders hasn't faced the same level of scrutiny as the former secretary of state, New York senator and first lady.

Her aides complain about Sanders' rhetoric, claiming he's broken his pledge to avoid character attacks by going after her paid speeches and ties to Wall Street, and they point to scenes of Sanders supporters booing Clinton's name at his rallies.

Actress Rosario Dawson's 15-minute speech at a New York City rally on Thursday, in which she rallied the crowd by crying "shame on you, Hillary" and noted that Clinton could soon face an FBI interview over the use of a private email server while at the State Department, underscored the growing tensions between the campaigns.

On Saturday, the bickering was about a possible debate before the New York primary on April 19. Clinton's campaign accused Sanders' of playing "political games" by rejecting three specific dates; the Sanders team was hopeful of an agreement soon.

Clinton hopes that big victories in New York and five Northeastern states a week later will allow her to wrap up the nomination by the end of the month.

But aides acknowledge that Sanders, who has raised $109 million this year and has pledged to take his campaign to the party convention in July, is unlikely to feel significant political or financial pressure to drop out of the race, even if it becomes clear he cannot win the nomination.

Clinton stayed in the 2008 contest against Barack Obama until the bitter end, though her initial advantage with superdelegates, who later flipped to the Illinois senator, gave her a stronger case for the nomination.

Unlike eight years ago, when California Sen. Dianne Feinstein brought Clinton and Obama together for a meeting, few Democrats are in position to broker peace between Clinton and Sanders. For most of his political career, Sanders, a self-described democratic socialist, identified as an independent " not a Democrat " leaving him with far weaker ties to party powerbrokers. Sanders has pledged to support Clinton if she's the nominee.

According to an Associated Press analysis, Sanders must win 67 percent of the remaining delegates and uncommitted superdelegates " party leaders and officials who can support any candidate " through June to be able to clinch the Democratic nomination. So far he's only winning 37 percent.

Joel Benenson, Clinton's chief strategist, said: "We're going to get to a point at the end of April where there just isn't enough real estate for him to overcome the lead that we've built."

Still, any kind of truce is probably weeks, if not months, away.

For now, Sanders is costing Clinton significant time, money and political capital. His victories in recent Western caucuses underscored her weaknesses among younger and white working-class voters, important elements of the Democratic coalition. He's favored in the Wisconsin primary on Tuesday.

Sanders is drawing sizable crowds in New York, attracting 18,500 to a rally in the South Bronx on Thursday. A victory in that state, which Clinton represented for two terms in the Senate, would deal a significant psychological blow to her campaign, rattling Democrats already worried about her high national disapproval ratings.

Clinton is more reliant on traditional fundraising than is Sanders, who's raised the bulk of his money online in small donations. Even as she prepares for New York's primary, she has scheduled fundraisers before then in Denver, Virginia, Miami and Los Angeles " at the home of actor George Clooney.

She needs to continue raising primary dollars because June contests in California and New Jersey will be expensive. Sanders faces fewer financial anxieties.

Sanders adviser Tad Devine said the senator was not encouraging his supporters to disrupt Clinton's events and was focused on his own message. But he also said the campaign would respond when Clinton mischaracterizes Sanders' record and positions.

Her attacks, he said, only help Sanders.

"When your attacks against your opponent feed the biggest weakness that you have, you are undermining yourself," said Devine.

WATCH: Sikandarabad shows class in Coffs Harbour Cup

Premium Content WATCH: Sikandarabad shows class in Coffs Harbour Cup

Experienced Scone gelding explodes to the line to claim resounding victory in Coffs...

NDIS opens up a whole new life for Tasel

Premium Content NDIS opens up a whole new life for Tasel

‘They really understood what I needed as a deaf person to be well supported.’

Region knows who to blame on border closure

Premium Content Region knows who to blame on border closure

Clarence Valley residents feel the latest QLD border closure is a fair decision...