I'm thinking of bribing local businesses to support my reelection
Why are you trying to cheat the election?
I've been doing this for a few years now and my reelection rate with this method is almost 100%.
Bribing others to win over votes is the epitome of corruption. While others may try it, you should stop using that tactic to get elected. Eventually, the officials will find out what you have been doing and charge you for your crime.
I only do it when the election is close and it would make a big difference to win or not. It's not illegal. The law states that you can't have someone perform an illegal action on your behalf as this sets a bad precedent.
Are you sure that it is not illegal? It seems like it would be wrong to bribe the vote a certain way. I think that you should reevaluate your practices.