Sen. Kay Hagan (D-N.C.) has raised $1.6 million in the last three months, a strong haul for the vulnerable incumbent.

Hagan has $2.7 million in the bank for her first reelection run, which could be a tough one. Republicans view her as one of their top targets, and her poll numbers show she could be vulnerable in the GOP-leaning state, though it's unclear who will step up to run against Hagan at this point. Rep. Renee Ellmers (R-N.C.) recently said she'll decide on whether or not to run for the seat in June.

"Senator Hagan's strong fundraising quarter shows that she is building the grassroots momentum from all across North Carolina that elected her in 2008 and that will re-elect her in 2014," said Hagan campaign manager Preston Elliott in a statement. "These resources will help ensure that Kay's message and strong record of results for North Carolina's seniors, students and veterans reach every corner of the state as she continues her work to get the economy back on track and grow jobs."