Today, the Republicans placed hardcore anti-tax Rep. Kent Lambert (R-Colorado Springs) on the JBC. This moves the median position on the JBC considerably rightward, which will undoubtedly affect state budgeting in the near term.
As with most moves by Ritter, there are two main interpretations available, one strategic and one sincere. The strategic interpretation is that Ritter recognizes that a) he's in a tough reelection fight and b) the state is in a tight budget bind. He will need to raise taxes to balance the budget, but he'd rather not, since that would hurt his reelection chances. So now he can blame Lambert for an inability to raise taxes. Marostica probably would have agreed to raising them.
The sincere (and, in my estimation, more likely) interpretation is that Ritter just kinda liked Marostica and thought it would be good to have him in the executive branch, regardless of the consequences for legislation.