A plurality (42%) of Likely U.S. Voters now has a favorable opinion of Marco Rubio, the Florida senator who gave the Republican response to President Obama’s State of the Union address last week, including 22% with a Very Favorable opinion. That’s up from 36% last month but comparable to his favorability rating last June when his name was in the news as a possible running mate for Mitt Romney.

A new Rasmussen Reports national telephone survey finds that 31% have an unfavorable opinion of Rubio, including 14% with a Very Unfavorable one. This is generally unchanged from previous surveys. Still, 27% do not know enough about Rubio to venture even a soft opinion of him. (To see survey question wording, click here.)

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The survey of 1,000 Likely Voters was conducted on February 16-17, 2013 by Rasmussen Reports. The margin of sampling error is +/- 3 percentage points with a 95% level of confidence. Field work for all Rasmussen Reports surveys is conducted by Pulse Opinion Research, LLC. See methodology.