That a short letter penned by an Iraq War veteran and signed by 46 of his colleagues in the Senate would earn the ridicule, scorn and derision of the left, while generating wobbliness among the more politically craven members of the right, is a testament to its virtue.

The primarily pedagogic letter’s detractors have invoked the Logan Act, signing a petition calling for the prosecution of the letter’s signatories on grounds of treason. But little could be further from treasonous than publicly opposing a policy that legitimizes and empowers a mortal enemy of America and her interests.

This Aug. 21, 2014, file photo shows Rep. Tom Cotton, R-Ark., as he speaks during a news conference in North Little Rock, Ark. (AP Photo/Danny Johnston, File)

This Aug. 21, 2014, file photo shows Rep. Tom Cotton, R-Ark., as he speaks during a news conference in North Little Rock, Ark. (AP Photo/Danny Johnston, File)

Worse still, legislators who in actuality undermined American interests by negotiating with our enemies are mentioned in the same light. This list of shame includes: John Kerry, Ted Kennedy and Nancy Pelosi among others.

The truth of the matter is that Sen. Cotton’s letter sticks in the craw of the left, causing it’s partisans to resort to ad hominem and absurd attacks. They do so primarily for four reasons:

1. Sen. Cotton’s letter forces the left to defend the indefensible

Whether addressing the congressional speech of Israeli Prime Minister Benjamin Netanyahu or the letter authored by Sen. Tom Cotton, the left rarely attacks on substance because it realizes the content of its opponents’ message is credible, and the character of the messengers is widely seen as unimpeachable.

The same cannot be said however of the deal that President Barack Obama seeks to consummate, and the parties sitting at the negotiating table.

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