The challenge for Trump has always been to keep being more and more outrageous while keeping the ugliness of his racist, xenophobic message in the background. He has gotten a lot of help on that front from journalists who are more interested in his PMS jokes than in his appeals to birthers and white supremacists, but eventually though, I believe we should see a break in the triviality and stories like the following will take a toll.
From TPM (which has been providing arguably the best analysis of the Trump campaign):
The fact that Trump backed off of his original statement is also worth noting.
Two days after a Boston man allegedly cited Donald Trump's anti-immigrant rhetoric as a reason for beating and urinating on a homeless Mexican immigrant, the presidential candidate finally condemned the crime on Friday.
Scott and Steve Leader were charged on numerous counts, including assault with a deadly weapon on Wednesday. Police said that Scott Leader mentioned Trump and said he took part in the assault because the man was Hispanic and homeless.