[1] Keller allied with the Conservative Caucus at a time when the legislature was still officially nonpartisan, although he identified as and was known to be a Republican.
[1] Dubbed a "gruff-voiced, cigar chomping, hard-bargaining Senate veteran," Keller was a leader in forming tax policy for the state.
He also actively promoted highway safety and, in 1959, introduced a bill that would have required seat belts and padded dash boards in all cars made after 1961.
He also served as chairman of a legislative interim study commission formed to analyze and make improvements to the Minnesota Highway Department.
[3] Keller was fined five thousand dollars for filing a false federal income tax return in 1969.