Bradley Smith says yes, and describes the left's opposition as:
[T]he left seems to think it is somehow illegitimate for management to speak to its own employees about how different candidates, and the policies they espouse, could affect the company. The left has two main fears: First, that corporations will say things it doesn't like; and second, that employees will listen.
The second fear, at least, is well founded. A report released this week by the Business Industry Political Action Committee (Bipac) found that employees ranked their employer's website as the most credible source of political information on the Internet, more than media sites or parties and candidates. Over 75% of the more than 500 respondents from a variety of industries indicated that employer-provided information was useful in deciding how to vote, and over a quarter said it made them more likely to vote.
This comes on top of past Bipac research showing that 47% of employees said that employer-provided information had "somewhat" or "strongly" increased their awareness of how various policy proposals affected their employers.