We already have a Democratic congress, with Democrat's running the major committees related to aviation. They can really slow down any merger deal by insisting on hearings and then getting them scheduled...eventually. So, the while a Democratic Administration might help prevent mergers, I'm not so sure that's all that necessary.

This gives our politicians a chance to support the "little" guy, the consumer and the airline employee, which they like to do. They did this in the failed USAir bid for Delta by suggesting strongly to USAir that if it could afford $12 billion for Delta, USAir could afford to take it's employee pensions back. Interestingly, that deal died shortly after.