Watch Bernie Sanders Sing With Vampire Weekend at Iowa Rally

In Iowa, Sanders and Clinton are locked in a statistical dead heat, with Clinton earning 45 percent support of likely caucus-goers compared with 42 percent for Sanders, according to a Des Moines Register/Bloomberg politics.

The Democratic presidential candidate says that if his supporters turn out in large numbers for Monday night’s caucuses, “I think you’re going to look at one of the biggest political upsets in the modern history of our country”.

A surge in support for Mr Sanders at this stage could seriously undermine Mrs. Clinton’s aspirations for success, and release yet more funding and support for a more liberal Democratic vision.

Any threat to pulling in as many young voters as possible is a real concern for the Sanders campaign, as both Democratic contenders are zeroing in on the enclaves of the state most favorable to their messages. And if Giffords’s speech in Ames is any indication, Clinton has a powerful tool to make her case on an issue that Bernie Sanders continues to struggle with.

Sanders, in the days before voters caucus, has enjoyed an surge of excitement, too. “Let’s not go around distorting a record that I am very proud of”.

She rebounded to win the New Hampshire primary, but Obama ultimately captured the nomination and the presidency.

On the Republican side, Donald Trump led Ted Cruz by 29% to 26% in the recent Iowan poll.

Echoing Obama, Sanders tells audiences that fundamental changes in the nation “never come from on top” but only happens with “millions of people standing up for justice”. She said, “I am the leader who has taken on tough issues”.

Clinton helped his wife ask the boisterous crowd of 1,500 at a music hall to show up for Monday night’s caucus vote, after a long day of campaigning separately across the state.

The statement comes after the Clinton and Sanders’ campaigns traded testy statements about plans for Thursday’s debate in New Hampshire and three more during the spring.

Before and during the caucuses, Sanders garnered the majority of Twitter mentions as he was mentioned over 77,000 times during the caucus, while Clinton only got mentioned 52,000 times.

But Democratic supporters seem to be responding to Clinton’s new energy.