I feel a little differently about this matter. Now, I agree with the Republicans on most issues and I want them to continue their winning ways. But I don't want it to be that easy. I think that competition helps the Republicans to be on their toes, to keep on communicating their ideas and policies, and to keep on pushing legislation. I want the Republican to fire up their base and then deliver -- not to take their base for granted.
Sometimes, a small part of me (just out of curiosity) wants to see Democrats nominate a fire-breathing anti-war candidate. For example, two years ago, I kinda wanted Dean as the Democratic candidate. Just so that Rove could carve him up and we'd get the final episode in the Trilogy of Thrashings (Episode I: 1972, Episode II: 1984).
In the end, I would take competition over curiosity, even though Markos Moulitsas Zuniga is quite charming.