How many House races are truly contested this year at either the primary race involving the eventual winner or in the general election? 5% or less? What about Senate seats? 10% or so? Almost all of the contested races are for open seats or where 2 incumbents were pitted against each other.
Oath taken by Respresentatives and Senators:
"I, (name of Member), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign or domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God."
This seems like a clear charge to me. Support and Defend the Constitution. It doesn't say anything about letting Judges rewrite it.
As you correctly point out, replacing members who are not adhering to this oath is a slow process especially in light of the current near split. Moreover, I think the movement to put the breaks on runaway courts is just now beginning to catch on. The process would surely accelerate if the people were more aware of the problem and made their voices heard not only in elections but in actively contacting their representatives and letting them know in no uncertain terms that they expect them to abide by the oath they have taken.
The people are also charged to support and defend the Constitution. Sadly it isn't until some rogue court or Mayor tries to shove something as outrageous as gay marriage down their throats that they start to pay attention.