MESA, Ariz. — Rick Santorum suspects something is up between Mitt Romney and Ron Paul. Santorum had a tough night at the 20th, and likely last, Republican debate, held here at the Mesa Arts Center. He took a lot of attacks from Romney and a few from Paul, and he noticed that Paul and Romney didn’t seem to go after each other. When it was all over, and Santorum met reporters, he didn’t try to hide what he was thinking.

“You have to ask Congressman Paul and Gov. Romney what they’ve got going together,” Santorum said.  “Their commercials look a lot alike, and so do their attacks.”