Chris dodd

Rubio Leads the Field in This Category: Missing Votes

Like McCain, left, and others, Rubio is missing more and more votes as he runs for president. (Bill Clark/CQ Roll Call File Photo)

For a presidential cycle known for upending conventional political wisdom, one thing certainly hasn't changed: It's hard to vote in the Senate if you're campaigning across the country.  

Like a young(er) John McCain from 2007, Sen. Marco Rubio, R-Fla., who missed every vote last week, leads the Senate in truancy for the year to date, voting just 68.7 percent of the time, according to CQ Vote Watch .