Senator Bob Corker (R-Tenn.) shrugs at a question from reporters as he walks to a closed-door briefing on talks with Iran in 2013. Corker is a leading proponent of raising gas taxes to boost the nearly-dry Highway Trust Fund.

Senator Bob Corker (R-Tenn.) shrugs at a question from reporters as he walks to a closed-door briefing on talks with Iran in 2013. Corker is a leading proponent of raising gas taxes to boost the nearly-dry Highway Trust Fund.

Credit:

Jonathan Ernst/Reuters

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