"I always tell people I'm running against two Democrats, one that admits it and one that does not"

This quote by Marco Rubio is a referral to his 2016 presidential project. He is suggesting that he is running versus 2 Democrats, one who honestly admits to being a Democrat and one who does not. This could be analyzed as a criticism of the Democratic Party, as Rubio is suggesting that a few of their members are closed about their political affiliation. It might also be seen as a way of highlighting the differences between the two significant parties, as Rubio is suggesting that the Republican Party is more open and honest about their beliefs. Eventually, this quote is a method for Rubio to stress his own political beliefs and to distinguish himself from the Democratic Party.