My opinion is the simplest:

Both of these gentlemen are US Senators, one representing Arizona and the other Illinois. Their primary responsiblity is to fulfill the oath of office they took as senators and get back to DC to represent their constituents' interests in this grave matter. Also, if they are the de facto heads of their respective party, then no justification on earth exists for ignoring their role by caring about personal glory instead.

I don't care for what job they are "interviewing" via the campaign trail. It does not matter if they are seeking the presidency or interviewing for the job as CEO of General Motors. JOB ONE is the one they are getting paid to do and which they swore an oath to complete. If they don't give a d^#* for their senatorial responsibilities, then its a fair bet they won't give a D^#* for the presidential ones either.

There are only 100 senators to represent 290,000,000 people. That should be their priority.

As a note: If either one of the two senators from FL were candidates for President right now and continued job-hunting instead of fulfilling their primary responsibility to the FL citizenry, then I'd be carrying the banner calling for their removal from office.