Do you think that politicians who run for President should resign their seats the day they announce?

I have been thinking about this for years. I guess I wonder if a politician is running around the country do they really get a feel of what is going on in Washington. I remember when McCain was running and one day he returned to Washington to vote but had not been there during any of the days of discussion of the issue (honestly I don't remember the bill), but I find it ridiculous that we pay them a Senator or House salary for up to two years while they are traveling across the country. I know this is going to be controversial but I am pretty sure it would be best for the country and state to have a full time representative in the seat for two years.