Hallowell was elected as a Democrat to the Fifty-second Congress. He was a delegate to the Democratic Presidential Convention that nominated Grover Cleveland for president, second term. He was an unsuccessful candidate for reelection in 1892.
Hallowell, a Democrat, served in the Fifty-second Congress and represented his party at the Democratic Presidential Convention that chose Grover Cleveland for a second term. However, he failed to win re-election in 1892.