The report itself is an insult to political conservatives, military veterans, American gun owners, and many others by suggesting that acts of violence could come from unnamed "rightwing extremists" concerned about:

abortion,
increasing federal power
restrictions on firearms
and it singles out returning war veterans as susceptible to recruitment.

Mr. President, I call your attention to the Department of Homeland Security’s January 2009 report on leftwing threats, which identifies actual terrorist organizations, like the Earth Liberation Front and Animal Liberation Front, which are accused and convicted of recent crimes including firebombing construction sites, logging companies, car dealerships and food science labs.

Conversely, the rightwing report uses broad generalizations about unnamed veterans, pro-life groups, any who lost their jobs, federalists and supporters of gun rights. It even states in one place that there is no specific information that domestic rightwing terrorists are planning acts of violence, but does ominously suggest that acts of violence could come from "rightwing extremists." The report creates a public cloud of fear and doubt about any who hold rightwing opinions whereas the leftwing report did not.