Romney formally announced on November 18, 1967, at Detroit's Veterans Memorial Building, that he had "decided to fight for and win the Republican nomination and election to the Presidency of the United States." His subsequent release of his federal tax returns – twelve years' worth going back to his time as AMC head – was groundbreaking and established a precedent that many future presidential candidates would have to contend with. He spent the following months campaigning tirelessly, focusing on the New Hampshire primary, the first of the season, and doing all the on-the-ground activities known to that state: greeting workers at factory gates before dawn, having neighborhood meetings in private homes, and stopping at bowling alleys. He returned to Vietnam in December 1967 and made speeches and proposals on the subject, one of which presaged Nixon's eventual policy of Vietnamization. For a while, he got an improved response from voters.