A new poll shows voters giving Rep. Paul Ryan (R-Wis.) a slight edge when asked which VP candidate is better qualified to serve as president.

The new survey from conservative-leaning outlet Rasmussen shows that 42 percent say the House Budget Chairman and Mitt Romney running mate would be more qualified to be commander-in-chief. Forty percent pick Vice President Joe Biden, with 18 percent undecided.

Ryan’s two-point edge, however, is within the poll’s 3-percent margin of error.

The survey comes after a difficult week for the vice president.