I'm afraid it might say more about Clear Channel's and Premiere's (Rush's syndicator) political views. Early on in the primaries, Rush said a couple of times that he thought Mitt was definitely the one Obama was counting on running against, that the whole OWS 1.0 was just a warm-up for running against Mitt. But Rush hasn't gone with that insight in months; in fact, he's seemed to largely avoid talking about the upcoming election.
Rush is too big to be pushed around by anyone - including Clear Channel. He has direct and sole control of the editorial content of his program. If his guest hosts are all spouting the pro-Romney line....well, it doesn't take an Einstein to figure out where Rush is on this election.