Sen. Russ Feingold (D-Wis.) is in a close heat with Republican Ron Johnson, according to new numbers out Thursday from Rasmussen. 

The poll gives Johnson a 2-point lead over Feingold — 48 percent to 46 percent. Two percent of voters prefer another candidate while 5 percent remain undecided. 

The numbers are largely unchanged from the last time Rasmussen polled the race two weeks ago. That poll had Johnson up 47 percent to 46 percent.

The poll showed Feingold running slightly better against Johnson's GOP primary opponent Dave Westlake. In a general election match-up between those two candidates, Feingold leads 49 percent to 39 percent.

The poll surveyed 750 likely voters and has a margin of error of plus-or-minus 4 percentage points.

Democrats have worked to paint Johnson as too far out of the mainstream. Johnson is backed by former House Speaker Dick Armey's FreedomWorks. He also has the endorsement of Sen. Jim DeMint's (R-S.C.) Senate Conservatives Fund.