I feel that Christians who use Christianity to advance a personal agenda - be it business (fish symbols on advertising) or politics as seen here - are going against Jesus' direct advice and example as outlined in Matthew 6:5.
Christians may do well to consider Jesus' own advice and example as written in John 18:36. The setting is that Jesus had been arrested by the Romans at the insistence of the Jews, and was now in the presence of a Roman politician who was charged with deciding his fate. At that point had the right and ability to step up as King and rule over mankind on earth. He did neither, instead telling the politician that his was not an earthly government, and demonstrating that he was going to be patient and wait until such time as God decided that He was to take action to govern.
True Christians follow that example, and realize that Christian involvement in human government is a waste of time and effort, as true Christians have faith that God's government will take over at His appointed time.
Anyone claiming to be Christian and running for public office is simply using Christianity for their own personal gain. Jesus likely does not approve.
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