Paul Bedard reports that National Republican Senatorial Committee Chairman John Cornyn, R-Texas, learned his lesson from the Charlie Crist fiasco:

Senate Republican leaders are still eating crow for endorsing Florida Gov. Charlie Crist in his Senate GOP primary against Marco Rubio, who won in the end.

Now, Whispers hears, the National Republican Senatorial Committee won’t endorse any 2012 candidate during the primaries. Committee Chairman Sen. John Cornyn is quietly telling critics of his Crist endorsement, especially conservatives, “I heard you,” says a GOP official. Now, even friends of the NRSC will get the same encouragement to run as others. “We will not endorse at the expense of the voters,” says the official.