Joe Biden

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Vice President Joe Biden, left, listens as Susan Trautman, Executive Director of The Great Rivers Greenway, gives a tour of the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)

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Sen. Michael Bennet, D-Colo., left, and Sen. Dick Durbin, D-Ill., listen as Vice President Joe Biden speaks during a visit to the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)

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Secretary of the Interior Sally Jewell, center, speaks as Vice President Joe Biden, right, and St. Louis Mayor Francis Slay listen during a visit to the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)

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Vice President Joe Biden, center, speaks as St. Louis Mayor Francis Slay, left, and Secretary of the Interior Sally Jewell listen during a visit to the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)

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Secretary of the Interior Sally Jewell, left, speaks as Vice President Joe Biden listens during a visit to the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)

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St. Louis Mayor Francis Slay, from left, Vice President Joe Biden, Secretary of the Interior Sally Jewell and Sen. Michael Bennet, D-Colo., take a tour of the CityArchRiver project at the Gateway Arch on Tuesday, May 13, 2014, in St. Louis. (AP Photo/Whitney Curtis)