Sorry but that's just wrong headed thinking. Use Cali as an example. We continually put up squishy Republicans for state offices and we continually lose seats. The main reason Whitman lost was that she couldn't garner enthusiasm from her own party.
I used to think the way you're thinking....need to appeal to a broader range of voters... but no longer. If the dems are going to vote for someone with their own core values they aren't going to have an R after their name!
Please don't be fooled by this ploy to keep strong conservatives out of office. We are in the fight of our lives and we need to stick together and not let the opposition split us up.