(AFP) Presumptive Republican nominee Mitt Romney was campaigning in Pennsylvania ahead of the state’s Tuesday primary with Marco Rubio in tow, the US senator widely discussed as a possible running mate.

Rubio is the latest among potential vice presidential picks to hit the campaign trail with Romney, but the first since the frontrunner’s main rival Rick Santorum bowed out of the Republican race two weeks ago.

Romney has already pivoted toward President Barack Obama ahead of the November election, and he told a crowd in Greencastle that Americans needed to help him battle against the cancer that is big government.

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