Tribes with casinos have made $4 million in political contributions so far this year, according to Gannett News Service.

In 2002, tribes with casinos gave nearly $6.8 million to politicians. This is up from $1,750 in 1990, according to Gannett.

"You know, the thing is, in politics, dollars open doors," Cow Creek chairwoman Sue Shaffer says.

Tribal donations are flowing to both political parties. As of this year, Democrats have received 64 percent of the $4 million, according to Gannett.

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Casino money opening doors for many tribes (The Arizona Republic 7/17)