Kay Hagan is saving up for a fight. (Lynne Sladky / AP) Kay Hagan is saving up for a fight. (Lynne Sladky/AP)

Facing a tough reelection fight, Sen. Kay Hagan (D-N.C.) raised over $2 million in the second quarter of the year, bringing her total cash on hand to $4.2 million, Democrats said.

So far State House Speaker Thom Tillis is the only major Republican in this race. After announcing his candidacy at the end of May, Tillis has raised about $300,000 and has $250,000 on hand. But Rep. Renee Ellmers (R) is still weighing her options. National Republican Senatorial Committee staff have met recently with Ellmers and state Senate leader Phil Berger, a likely sign that they're not quite confident in Tillis. 

North Carolina is close to a pure battleground; Mitt Romney won there by 2.2 percent in 2012.

Hagan wasn't the only candidate to announce that she raised $2 million on Thursday.

Sen. Al Franken (D-Minn.), another potential Republican target, announced nearly $2 million raised in the second quarter and has $3 million on hand.

And Senate Minority Leader Mitch McConnell (R-Ky.) announced $2.26 million raised and $9.6 million cash on hand -- giving him a huge early advantage on newly minted Democratic candidate Alison Lundergan Grimes.

Updated at 2:01 p.m.