He didnt need to, they already got the message.
In 2009, the White House created an email address firstname.lastname@example.org and encouraged people to report their neighbors who might disagree with Obamacare. The DNC admitted the White House was engaged in collecting information on people.
During August recesses in 2009, the Obama Adminstration told Democrats in Congress to “punch back twice as hard” at Republicans.
In 2011, the Obama White House set up a ridiculous website called Attack Watch to document and expose those hostile to them.
As I wrote in 2009, the Obama team brought back the politics of personal destruction. I noted then a Politico story that reported
The vast new left-wing conspiracy sets its tone every morning at 8:45 a.m., when officials from more than 20 labor, environmental and other Democratic-leaning groups dial into a private conference call hosted by two left-leaning Washington organizations.
In 2012, the White House directly coordinated with outside groups to influence the Supreme Court’s Obamacare decision. About the time these meetings with “dozens of leaders of nonprofit organizations” were happening in the White House, tea party groups were suddenly getting inquiries from the IRS, bogging them down and distracting them from the fight at hand.
President Obama did not have to tell the IRS specifically to harass conservative, evangelical, and Jewish groups who might oppose him. His rhetoric on the campaign trail and in the permanent campaign of the White House operations made clear what he wanted. IRS agents not only harassed conservative groups, evangelical groups, and Jewish groups, but also leaked their confidential tax information to left-leaning groups. The National Organization for Marriage and other groups had their donor lists leaked subjecting those donors to harassment. A Romney donor was harassed by the IRS. More than one person has emailed me to say that after they reported themselves to email@example.com they were audited by the IRS — in one case audited several times about just one tax year.
Obama went on the campaign trail in 2010 and told supporters to “punish our enemies.” The IRS did just that. The need for specificity or explicitness was unnecessary.