Political reforms in Mexico have made it much harder to steal an election, officials say. But a lot of people think you can still buy one.

As voters go to the polls on Sunday to elect a new president, allegations are flying that candidates are offering money and swag, flouting campaign-spending limits in the process.

Most allegations are aimed at the Institutional Revolutionary Party, or PRI, which polls say holds a sizeable lead after being ousted from the top office by voters 12 years ago.

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