The nation's largest teachers' union on Monday endorsed President Obama's reelection 16 months before Election Day 2012, but then most Republicans already have a negative opinion of the National Education Association. Democrats, on the other hand, are big fans. A new Rasmussen Reports national telephone survey finds that 42% of all Likely U.S. Voters hold at least a somewhat favorable opinion of the NEA, with 17% Very Favorable. Thirty-seven percent (37%) regard the teacher's union at least somewhat unfavorably, including 22% with a Very Unfavorable view. Twenty percent (20%) are not sure what they think of the group. (To...