More fallout from the recall vote was visible today as Rasmussen published a poll on the presidential race in Wisconsin:

Mitt Romney now leads President Obama for the first time in Wisconsin where the president's support has fallen to its lowest level to date. 

The latest Rasmussen Reports statewide telephone survey of Likely Voters shows Romney with 47% of the vote to Obama's 44%. Five percent (5%) prefer some other candidate, and four percent (4%) are undecided. (To see survey question wording, click here.)

Prior to this survey, Obama's support in the state has ranged from 45% to 52%, while Romney has earned 41% to 45%. Last month, the numbers were Obama 49%, Romney 45%. The president led his likely Republican challenger by 11 points in March - 52% to 41%.

Just last week Republican Governor Scott Walker won a special recall election prompted by Democrats outraged over his successful move to limit collective bargaining rights for some unionized public employees in order to reduce Wisconsin's budget deficit.

Most voters (51%) in the state view public employee unions unfavorably, while 46% share a favorable opinion of them. This includes 33% with a Very Unfavorable view of the unions and 27% with a Very Favorable one. The president draws overwhelming support from voters who view public employee unions favorably, while Romney draws equally heavy support from those who view them unfavorably.

Forty-seven percent (47%) of voters in Wisconsin approve of the job Obama is doing, while 52% disapprove. These findings include 27% who Strongly Approve of the president's job performance and 44% who Strongly Disapprove. These ratings are comparable to those measured nationally in the Rasmussen Reports daily Presidential Tracking Poll.

Romney is viewed favorably by 49% of Wisconsin voters and unfavorably by 45%. These numbers include Very Favorable reviews from 23% and Very Unfavorable ones by 30%.

Given the margin of error, this race is virtually tied. But Obama's approval numbers are a real danger sign. Anything below 50% approval makes a victory in Wisconsin problematic for the president.

The fluctuations over the last few months suggest a very volatile electorate. It wouldn't be a surprise if the two exchanged places at the top spot for the rest of the race.