WASHINGTON--A CNN Wisconsin poll released on Thursday--done after Mitt Romney tapped Wisconsin Rep. Paul Ryan--to be his runningmate--shows President Barack Obama ahead 49-45 among registered voters-but, according to CNN, now more competitive--a tossup battleground state.

Ryan, from Janesville has higher favorable ratings than Romney in the survey:
Favorability
54 Obama
50 Ryan
45 Romney
44 Biden

From CNN on the poll:
Interviews with 1,005 Wisconsin adults conducted by telephone by ORC International on August 13-14, 2012. The margin of sampling error for results based on the total sample is plus or minus 3 percentage points. The sample also includes 920 interviews among registered voters (plus or minus 3 percentage points).
The sample includes 750 interviews among landline respondents and 255 interviews among cell phone respondents.