Mitt Romney's father, George Romney, paid an effective tax rate of nearly 37% in 1967.
CNN: Mitt Romney vs. stubborn facts
2.
However, the Obama re-election team often points to Romney's father, the late George Romney, who released 12 years of tax returns when he ran for president in 1968.
CNN: Obama, Romney ratchet up back and forth over outsourcing
3.
He is set to surpass his father, George Romney, a former Michigan governor who ran unsuccessfully for the Republican nomination in 1968.
BBC: Mitt Romney clinches nomination in Texas primary