Sen. Ron Johnson (R-Wis.) said this week he may not be the best Republican candidate for the current election cycle, pointing to how he is targeted frequently by critics. “I want to make sure that this U.S. Senate seat is retained in Republican hands,” Johnson told radio host Lisa Boothe. “You see what the media’s doing to me. I may not be the best candidate. I wouldn’t run if I don’t think I could win if I don’t think I was the best person to be able to win,” he added. Johnson, 66, entered the Senate in 2011 and won reelection in 2016. But he has put off declaring a bid for another term, effectively freezing the Republican field, even though he received an endorsement from former President Donald Trump. “Even though he has not yet announced that he is running, and I certainly hope he does, I am giving …