Republicans believe in the mutual benefits of free trade of goods and services. Democrats believe in "fair trade," and support barriers that shield domestic industries against competition, reducing the incentive to innovate and change to remain competitive.

Republicans consider the Constitution a contract, limiting the duties, powers and obligations of the federal government. Democrats consider the Constitution a "living, breathing document," to be interpreted flexibly. Republicans, for example, reject Roe v. Wade because the court based it on a right to privacy, not mentioned in the U.S. Constitution. Democrats consider the right to privacy implied, despite the absence of any reference to it.

Republicans believe in the Second Amendment, and that it confers an individual right to keep and bear arms. The Founding Fathers wanted this right to protect against tyranny by government. Democrats consider the Second Amendment an impediment to public safety.

Michigan, six years ago, became one of about 40 "shall issue" states that now allow citizens to apply for a permit to carry concealed weapons. At the time, law enforcement officials predicted an increase in violent crime. In fact, the opposite happened.

Woodhaven Police Chief Michael Martin said, "I think the general consensus out there from law enforcement is that things were not as bad as we expected. There are problems with gun violence, but I think we can breathe a sigh of relief that what we anticipated didn't happen."

So how did the president of the Michigan chapter of the anti-gun group Million Moms March respond? She called the statistics bogus, and argued that even if true, society still possesses too many guns.

And this brings us to our final observation:

Republicans believe what they see, and Democrats see what they believe.