"Congress doesn't seem to have the same cordiality," Colorado Gov. John Hickenlooper, a Democrat, quipped, when asked about gridlock in Washington. "Where's the constituency for moderation?"
Hickenlooper, who last year faced the mass shooting at a suburban Denver movie theater, discussed action he and the Democratic-controlled legislature took to require comprehensive background checks for all firearm sales, as well as an increase in mental health spending.
Still, the political divisions that have mired Washington were present in Milwaukee.
Wisconsin's Walker noted how he signed legislation passed this year by the Republican-controlled legislature increasing mental health screening, but stopping short of raising restrictions on gun sales.
"There's a much bigger issue of mental health concerns that goes beyond the tragic incidents like this," said Walker. There were two mass shootings in Milwaukee suburbs last year.
Associated Press writer Scott Bauer contributed to this report.
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