CTV reports that the Conservatives are running radio ads today, attacking the coalition, while pumping budget passage. The timing is curious, and probably not by accident.
The huge bounce the government received, in the aftermath of the coalition threat, has clearly waned, with every polling outfit confirming a significant shift from the soaring heights of early December. Within that reality, I assume the Conservatives polling reveals the same, there might be some nervousness which probably led to another round of attack ads. A tightening race, coupled with some evidence that the coalition concept is marginally more acceptable, and you can see why the Conservatives might want to attack.
Running radio ads is probably the smart move, because they get less attention than the television variety. The Conservatives can't afford to look to partisan or hostile, because that feeds all the cementing negative narratives. That said, the fact the Conservatives feel the need to run any ad, and risk looking partisan, is probably a statement that they have some genuine fear, that demands addressing.